Have K70 on front of my G5 with sidecar attached. 2800 miles (4500km) and there's not much tread left in the center so looking to replace it with a tire with better tread life, harder rubber in center. Attribute wear to k70's softer rubber and extra weight of sidecar when braking. Of the tires mentioned which ones are the best mileage wise? Recommendations i've had are: Michilin pilot active and Bridgestone s11 spitfire. Thanks,Al